Dentist s anvil



May 3 9 .1. s. BECKER DENTISTS ANVIYL Filed March 10. 1924 'nvenrov. JOSEPH .5? PEG/(16 Patented May 3, 19 27.

JOS I EPH s. ,PECKVERJ.OEPHILADELPHIA;PENNSYLVANIA, ASSIGNOILNBY MESNE As 'SLGNMEN'IS, 'ro nI'XiEnEN'rAL-MANUFACTURING 00., F PHILADELPHIA, 2mm

'sYnvA'NIA,A oonronn'rron or PENNSYLVANIA.

"dDENTISTS ANVI L.

Application filedMarch 10, 1924. Serial No; 698,179. r

l My invention relates tohdentists anvil for themakingflof backings used to interchangeably mount artificial teeth in. crown and bridge worlni '5 glft has long 'beenthe practice toprovidex interchangeablefacings having an' 'underQ cutslot opening through a lingual isurface of the facing; and a backing plate carrying a shouldered pin adapted to lit into said slot, after which the backing was cemented to the lingualsurface of. the facing. I

Anvils have been heretofore; designed for l the manufacture of .fiat. bachings adapted 7 on .themarketf an interchangeable root facing which difiers from the previous facings in havingfian enlarged rootextensionat, its

, gingival endwhich provides an angled seat 0 for the'backin'g. V I

The primary object of my present invention is to perfect a dentists anvil adapted for the production of angled backings carrying pins fori'interchange'ably mount ngroot facings.

A further object of invention is to perfect dentists anvils for the production of all types of backings-,'and the-special features of novelty consist in the provis1on of 3 a saw ormil-ling'tool adapted in cutting the slot to leave the inner end wall of. the upper fit snugly against and close the inner end of the slot, thereby. z'u oiding the diff cult and expensive work now required in facing up this end wall of the slot; the provision of an ejector carried by the anvil and adapted to positively eject the pin after attachment to thebacking plate from the anvil and finally theffa cing oft of the forward corner. of the anvil to. present a face at right angles to the'pin' hole, thereby facilitating the easy and accurate drilling of said hole."

My invention also comprises the noveldetails of construction and arrangements of parts, which in] their preferred construction only are illustrated in the accompanying drawings which form a part of this speci- 1 fication and.in'which:+' j i v Fig. 1 is a side view of the anvil.

for the interchangeable mounting of the fac-. ings above describedu There has'nowcomej the pinhole with a bottom slot to'make self clearing of any matterthat maybecome. fllodgedutherein; the cutting of this slot by slot so shaped that the web of the pin will opening 13 in the anvil bottom 2.

vertical member of the ejector is disposed at J 2' is a vertical cross-sectional view taken in the plane of the pin slot, the curved line showing the travel of the milling tool used to cut the slots and face wall thereof one operation. 1

up the end I Fig. 3 is a perspective viewenlarged of the anvil showing a backing formed thereon and having one of the pin flanges swaged down against the plate, the other being shown upright, in a position in which it isinserted through a hole provided therefor in the backing plate.

; Fig. i is a detail. perspectiveview of a pin suitable for, use with the anvil.

Similar reference numerals refer to similar parts throughout the drawings. In the embodiment of my invention illus- 'trated, the anvil is formed *of rectangular. block ofsteel 1 having a fiat bottom face 2;

andhaving an angledtop comprising three faces3, 4 and 5. work faces and they areshown disposed at an angle correspondingto the angle between The facesl anda arethe the cusp seats formed on the lingual faces" of the root facing. I show abacking plate I hahole 9- having a diameterto adapt it-oto receive. with a; very close snug fit thepin S.

-Tl1is hole extends through theback wall 10. of theanvilrand is adapted toireceiventhe upper end of an ejector 11 formed by a Gwhich isprovided withai'holeadapted to receive the flanges 7 ofthe pin 8 andwhich. has vbeen shaped to the angle of theanvilfaces 3. and l. I drill at right angles to. the anvil face, 5, and parallel "withthe" face piece ofbent wire, the lower end of which is inserted in a hole near the bottom of the wall 10'and locked therein by a set screw 12 which is screwed up through a threaded The an angle to the back face 10 and has suffcient spring to permit it to be forced towards said face and to, project its free ejector end 11 far enough throughthe hole 9 to engage and eject the pin 8,]thus facilitating the removal of the assembledbacking from the anvil. The flanges? of thepin 8 rise from side walls 17 which project through atop slot 14; leading from the pin hole9 upwardly through the face 4 and the upper edges ofthese walls stand flush'witlr the surface a. The slot stopsshort of the base of the face Below, and in line with this upper slot 14., is a bottom slot '15 which is provided to make the pin hole. 9 self clearing and to permit the use of a --'-iw or milling tool to cut the slots 1 t and in one operation, it being observed that the axis of the saw is placed in line with or below the plane of the face. This is important because the saw when thus placed will cut away the end wall 16 of the slot l l so that it stanes approximately at right angles to the face l. ln fact the drawings show the wall slightl unde lit and the in portance of this feature that no treatment of the end wall lb of the slot is required to enable the walls 11' of the pin to fit snugi s from the upoer edge or ay :1 contact with tle lower n \'-:all a slight portion of the slot l c left unclosed and when the 'ilate n'icx'ed lown on the anvil would be defaced by elrtering that uncovered part of the slot and the requisit smooth tooth engaging surface would not result.

In operation, a pin 8 is placed in the an vil and a backin plate having the requisite outside dimensions and center hole for the pin flanges is mounted on the anvil and shaped to fit against its faces 3 and l in the manner well understood in this art. The pin flanges are caused to project through the backing plate hole and are then swaged over and soldered to the plate. If the complete backing will not slide off readily from the anvil the ejector 11 is pressed or struck and the assembled backin is driven out by the engagement of the e ector 11 with the pin which carries with it the backing plate without deforming the latter.

By the use of my invention the dentist can prepare in his own laboratory the backings for his crown and bridge work, buying only the root facing and the standard pins, and this will greatly facilitate the extension of the use of root facings throughout the profession.

Though I have described with great particularity the details of the embodiment of the invention herein shown, it is not to be construed that I am limited thereto, as changes in arrangement and substitution of equivalents may be made by those skilled in the art without departing from the invention as defined in the appended claims.

Having thus described my invention, What I claim new and desire to secure by Letters Patent, is

1. An anvil having a downwardly inclined work face. an upwardly inclined work face at the inner end of the first mentioned work face, and a downwardly inclined drilled face at the outer end of the first mentioned work face and disposed at right angles thereto, there being a pin hole drilled at right angles to said drilled face through the anvil with its axis parallel with the first mentioned work face, and a slot connecting the pin hole with the downwardly inclined work face and extending from the drilled face sub stantially to the upwardly inclined work face.

A dentists anvil having a work surface, there being a pin hole drilled through the anvil with its axis parallel with the work surface and having a slot connecting it with said surface, and an ejector carried by the anvil and movable through the back end of said pin hole, and for the purposes described.

3. A dentists anvil having" a pin hole drilled therethrough with its axis parallel with the anvils work face, there being a slot milled through a corner of the anvil in a plane vertical to the work face which bisects said hole and defines a circular cut which leaves the inner end wall of the slot nature.

JOSEPH S. PECKEB. 

